Mental Task Evaluation for Hybrid NIRS-EEG Brain-Computer Interfaces

Table 2

EEG-only peak for each subject and task pair, when using features extracted from one-second windows. Task pairs and participants are shown in descending order of average , from top to bottom and left to right, respectively. values between 0.4 and 0.7 (satisfactory performance) are highlighted in italic font, whereas kappa values greater than 0.7 (high performance) are  highlighted in bold font. The average peak time with standard deviation is also included for each task pair. .

	S10	S03	S07	S06	S05	S11	S01	S09	S04	Average	Peak time (s)
ROT-MI	0.93	0.89	0.87	0.95	0.84	0.80	0.77	0.77	0.61	0.83 0.10	3.83 3.3
ROT-FACE	0.86	0.86	0.84	0.94	0.92	0.68	0.79	0.66	0.51	0.79 0.14	2.61 1.0
ROT-SING	1.00	0.80	0.86	0.81	0.90	0.71	0.81	0.56	0.53	0.78 0.15	5.61 4.4
ROT-NAV	0.96	0.72	0.83	0.61	0.68	0.58	0.75	0.58	0.63	0.70 0.13	4.06 1.0
SUB-MI	0.91	0.89	0.82	0.91	0.81	0.74	0.70	0.85	0.39	0.78 0.16	4.28 2.1
SING-SUB	0.99	0.72	0.73	0.82	0.89	0.65	0.77	0.68	0.42	0.74 0.16	2.50 1.6
SUB-FACE	0.65	0.84	0.71	0.88	0.87	0.62	0.76	0.68	0.37	0.71 0.16	6.39 5.0
ROT-WORD	0.96	0.74	0.69	0.61	0.90	0.62	0.56	0.50	0.53	0.68 0.16	5.94 5.3
NAV-MI	0.78	0.86	0.78	0.81	0.66	0.66	0.60	0.46	0.41	0.67 0.16	5.61 5.3
WORD-MI	0.96	0.61	0.75	0.88	0.57	0.64	0.58	0.63	0.44	0.67 0.16	5.83 3.8
WORD-FACE	0.75	0.73	0.67	0.87	0.73	0.64	0.65	0.44	0.36	0.65 0.16	6.06 3.9
SING-NAV	0.83	0.69	0.72	0.69	0.72	0.64	0.74	0.27	0.43	0.64 0.17	3.39 2.1
SUB-NAV	0.88	0.59	0.71	0.46	0.69	0.46	0.55	0.66	0.33	0.59 0.16	3.61 5.8
WORD-SING	0.88	0.66	0.73	0.84	0.53	0.53	0.73	0.36	0.35	0.62 0.19	5.61 6.6
ROT-SUB	0.72	0.60	0.66	0.39	0.38	0.53	0.66	0.50	0.43	0.54 0.13	4.06 5.2
WORD-SUB	0.88	0.69	0.42	0.63	0.75	0.37	0.40	0.68	0.44	0.58 0.18	3.94 2.9
NAV-FACE	0.53	0.79	0.54	0.80	0.82	0.49	0.44	0.28	0.28	0.55 0.21	5.39 4.8
WORD-NAV	0.79	0.55	0.63	0.41	0.46	0.50	0.48	0.35	0.30	0.50 0.15	3.17 2.8
SING-MI	0.78	0.56	0.39	0.47	0.36	0.41	0.25	0.38	0.40	0.44 0.15	2.39 2.4
FACE-MI	0.62	0.60	0.37	0.42	0.35	0.49	0.21	0.35	0.51	0.44 0.13	1.61 2.2
SING-FACE	0.63	0.47	0.30	0.50	0.39	0.28	0.25	0.27	0.22	0.37 0.14	5.06 5.5
Average	0.82	0.71	0.67	0.70	0.68	0.57	0.59	0.52	0.42	0.63 0.16	4.33 3.7